I feel quite well identified with your post. I have been feeling like that since I was about fourteen. I don’t think it’s a trait only in bpd but for a person with bpd there are many posibilities to display this trait. Take into account that bpd is based mainly in instability in different sides: mood, self-sense, even reasoning (sometimes we perceive things very clearly and can read peiple and situations very well but other times, specially when feelings are involved, we drive ourselves without clues). I think all that make us feel outside.